A new bombshell came on Wednesday when Robert S. Mueller III, a former F.B.I. director, was named special counsel to oversee the investigation into Russian meddling in the United States presidential election.

A few days later came reports that the president had shared highly classified intelligence about the Islamic State — which the United States had not even shared with its allies — with the Russian foreign minister.

The next day, we learned that Mr. Comey had written in a memo that Mr. Trump had asked Mr. Comey back in February to drop the F.B.I. investigation into his now-fired national security adviser, Michael T. Flynn.